<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    function Foo(){
        console.log(this);
    }
//    Foo();\
//    Foo.call({x:10})
    var o = {x:10};

    var f = Foo.bind(o);

    f();

//    f.call({y:20});
</script>
</body>
</html>